Oil burner



c. J. HARRAH 2,466,100

OIL BURNER April 5, 1949.

Filed Jan. 19, 1946 I N VEN TOR. 6949M; J, #54201.

Patented Apr. 5, 1949 UNITED STATES PATENT OFFICE OIL BURNER Charles J. Harrah, Denver, Colo. Y Application January 19, 1946; Serial No. 642,342

1 Claim. 1

This invention relates to an oil burner, more particularly designed for installation in household and. commercial heating plants, cook stoves, and thelike.

The principal object of the invention is to provide a burner of this type which will obtain an efiicient mixture between the air and the oil by making use of the incoming air to spray the oil into the combustion zone, and to provide a burner in which it will not be necessary to pump or maintain pressure on the fuel oil.

A further object is to provide automatic means for supplying the oil, so arranged that the oil entering the combustion mixture will be automatically proportioned to the amount of the incoming air.

Other objects and advantages reside in the detail construction of the invention, which is designed for simplicity, economy, and efficiency.

These will become more apparent from the following description.

In the following detailed description of the invention, reference is had to the accompanying drawing which forms a part hereof. Like numerals refer to like parts in all views of the drawing and throughout the description.

In the drawing:

Fig. 1 is a vertical sectional view, illustrating the operating parts of the improved burner; and

Fig. 2 is a horizontal section therethrough, taken on the line 2-2, Fig. 1.

The improved burner employs a standpipe extending upwardly from a T-fltting H through suitable reducing bushings 13. The bottom of the T-fitting is closed by means of a drilled plug M which supports and axially positions a tubular air nozzle IS.

The air nozzle is capped by means of an orifice cap Hi. The fuel is supplied from a float chamber l'l containing a suitable float l8 for operating a float valve I9. The fuel flows to the float chamber 11 from any suitable reservoir through a feed pipe 20. The float chamber ll and the float 18 are positioned at an elevation which will maintain a liquid level, as indicated by the broken line A, at a point below the upper extremity of the standpipe Ill and above the orifice cap l6, as shown in Fig. 1.

Compressed air is supplied to the air nozzle l5 through an air line 2|, controlled by means of a cock 22, the preferred pressure on this air in the usual installation being about 100 p. s. i. A secondary air chamber 23 is supported about the upper extremity of the standpipe Ill. The upper extremity of the air chamber 23 is open. The

bottom. thereof is. threaded on or otherwise at-' tached to the standpipe Ill. The latter: bottom is; provided with. secondary air openings 24 surrounding the standpipe. Ill. These airopenings are controlled by means of a rotatable port plate 25 having ports 26 therein which can be brought into register with the ports 24 of the bottom of the secondary air chamber 23.

The orifice cap I6 is perforated with a very small orifice approximating a No. 30 drill. This orifice, the upper extremity of the standpipe l0, and the air chamber 23 are so positioned that a line drawn from the orifice cuts the upper edge of the standpipe I0 and the upper edge of the secondary air chamber 23, as illustrated in Fig. 1.

In use, the float chamber I1 is filled with oil, which of course brings the oil level in the T- fitting H and the standpipe II] to a point above the orifice cap it. Air is then admitted under pressure to the air nozzle 15. This air blows from beneath the surface of the oil in the standpipe ID, picking up and vaporizing the latter into an inverted conical combustion area, as indicated at B in Fig. 1, which carries the flame of the burner.

The air and vapor, in blowing across and upwardly between the standpipe l0 and the secondary air chamber, create a suction in the latter which draws secondary air through the ports 24 and 26.

The latter ports are adjusted by means of an adjusting ear 2'! to obtain the proper degree of combustion, after which the port plate 25 can be locked in position by means of a set screw 28. An adjusting rod 29 may be provided in installations where the port plate cannot be conveniently reached.

It will be noted that the incoming air both supplies and vaporizes the fuel to the flame. No pressure is placed upon the fuel and the fuel entering the flame is directly proportioned by the amount of air discharging from the orifice in the cap l6 so that an automatic control is obtained. In the usual installation the orifice plate is rested upon the grate bars of the usual furnace or stove, the position of the surface of whichis indicated in broken line at C in Fig. 1.

While a specific form of the improvement has been described and illustrated herein, it is desired to be understood that the same may be varied, within the scope of the appended claims, without departing from the spirit of the invention.

Having thus described the invention, what is claimed and desired secured by Letters Patent is:

I An oil burner comprising: a vertically positioned standpipe having an open upper (and; means for maintaining fuel oil in said standpipe at a pre-determined level adjacent the open up per end of the standpipe; an air nozzle axially positioned Within said standpipe and terminating belowthe pre-dtermined level therein and being provided with an axially positioned air discharge forific'e in its upper extremity: means for supplying compressed air to said air nozzle so as to direct a jet of air through the fluid surface to spray the fuel oil in an inverted conical spray from the open upper extremity of said standpipe;

a bell-shaped secondary air chamber; a bottom 1 in said secondary air chamber, said standpipe passing through said bottom and supporting said air chamber concentrically about the upper ex:

tremity of said standpipe, the upper extremity of said air chamber being open at its top and having a lesser diameter than said bottom, said open top being positioned above the upper extremity of the standpipe and the open upper end of said standpipe being positioned above said orifice at levels which will cause the exterior surface of 3 entering through said po CHARLES J. HARRAI-I.

REFERENCES CITED The following references are of record in the file of this patent:

' UNITED STATES PATENTS Number Name Date 15 1,338,104 Shurtleif Apr. 27, 1920 1,601,242 Ennis Sept. 28, 1926 1,621,447 Williams Mar. 15, 1927 2,121,271 Szabo June 21, 1938 2,150,764 Farineau Mar. 14, 1939 20 2,309,762 Gearhart Feb. 2,1943

- FOREIGN PATENTS Number Country Date Norway Aug. 14, 1944 

